18239328 has 36 divisors (see below), whose sum is σ = 51868908. Its totient is φ = 6079680.

The previous prime is 18239323. The next prime is 18239339. The reversal of 18239328 is 82393281.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 18239292 and 18239301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18239321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31378 + ... + 31953.

It is an arithmetic number, because the mean of its divisors is an integer number (1440803).

Almost surely, 2^18239328 is an apocalyptic number.

18239328 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18239328 is an abundant number, since it is smaller than the sum of its proper divisors (33629580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18239328 is a wasteful number, since it uses less digits than its factorization.

18239328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63347 (or 63336 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 18239328 is about 4270.7526268797. The cubic root of 18239328 is about 263.2305418745.

The spelling of 18239328 in words is "eighteen million, two hundred thirty-nine thousand, three hundred twenty-eight".